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This suppresses the "Your computer is discoverable..." system
notification when turning on high visibility mode using the toggle in
the Nearby settings subpage.

This will need to be cleaned up with a better abstraction when
addressing tech debt in crbug.com/1155669.

Fixed: 1158521
Change-Id: If5a5de8846f090a79f69d0b799e7d5a0d35ee104
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622579Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Cr-Commit-Position: refs/heads/master@{#842565}